Can anyone give me an idea of what im going to be spending to have my stock L98 heads and TPI plenum professionaly ported? and possibly polished on the plenum as well?

 

For plenum and intake manifold porting contact 385IN2005, he has an album of some of his work. As for the heads, the little gain and price to port and rebuild them, you would be better off buying aftermarket heads. Here's his link;https://www.thirdgen.org/forums/tpi/...-pictures.html